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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 815,647	$ 828,336
Allowance for Expected Credit Losses	(186)	0
Gross Unrealized Gains	5,465	27,973
Gross Unrealized Losses	(1,065)	(1,025)
Fair Value	819,861	855,284
U.S. government obligations and agencies [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,529	53,688
Allowance for Expected Credit Losses	0
Gross Unrealized Gains	157	864
Gross Unrealized Losses	(55)	(188)
Fair Value	59,631	54,364
Corporate bonds [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	416,758	457,180
Allowance for Expected Credit Losses	(148)
Gross Unrealized Gains	3,571	19,179
Gross Unrealized Losses	(337)	(141)
Fair Value	419,844	476,218
Mortgage-backed and asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	319,377	304,285
Fair Value	319,937	311,079
Mortgage-backed and asset-backed securities [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	319,377	304,285
Allowance for Expected Credit Losses	0
Gross Unrealized Gains	1,175	7,400
Gross Unrealized Losses	(615)	(606)
Fair Value	319,937	311,079
Municipal bonds [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,990	3,397
Allowance for Expected Credit Losses	0
Gross Unrealized Gains	138	103
Gross Unrealized Losses	0	(4)
Fair Value	12,128	3,496
Redeemable preferred stock [Member]
Debt Securities, Available-for-sale [Line Items]
Allowance for Expected Credit Losses	(38)	0
Redeemable preferred stock [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,993	9,786
Allowance for Expected Credit Losses	(38)
Gross Unrealized Gains	424	427
Gross Unrealized Losses	(58)	(86)
Fair Value	$ 8,321	$ 10,127

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